If you’re on FB, join a group called Magnum EFI Swap Group. There’s a guy on there by the name of Kerry Kinser who sells a fuse/relay box that plugs directly into the 98-01 harness and only requires hooking up 3 wires to your car. Real nice, basically plug and play option.
If you pull the PDC out of the doner vehicle, the entire engine harness stays intact (you can eliminate most of the PDC to vehicle wiring) and it’s as easy as hooking up a battery + to the PDC and hooking up an ignition power lead, and a start lead.